finally finished my head. a little porting, a little epoxy,a little combustion chamber work. .045 hg, jerry at cooper perf. decked .015 and comp. blended valve job. now for some cams and tuning.
http://www.zx-10r.net/forum/album.php?albumid=538guys, pictures came out wrong on post, i did not post correctly, available on profile site under albums, simply click on pictures, thanks. sorry, not computer savy.:dontknow:
I'm not disagreeing with what you are saying about lumps and tooling marks etc. I'm talking about the actual finish of the metal, its like a bore having a 45 degree crosshatch pattern, in theory it increases friction in the bore but it also allows the oil to lubricate the rings properly therefore decreasing friction.my friend david at rockdale cycles, 20 miles away has a flowbench ive used before. works great on early kz heads that flow 68 cfm stock,and you need 90 to 100, it was very helpful.not so today, did i mention home built. you are wrong about todays engines with 12.7 cr needing help burning fuel. lumps, pits, tooling marks promote turbulance alright impeding flow,my port finish is 80 grit sand roll, produces great boundry layer for atomization. you heard of fuel inj?, atomizes fuel rel well. between fi, my port finish,especially compared to stk.,my .026 quench, thin head gasket, increasedcomp. from decking,and injectors cleaned and flowed, i got atomization covered. many things done to my head are to promote fast , complete burn necessary at 13k. as i said its the sum total of little things that produce more power in todays engines. as stated, kawasaki built a good head, the best builders in the country cant make but a few more horsepower in the head alone, with thier flowbench. its the sum of little things made right after mass production. by the way, flowbench numbers can really fool you at the track,i can guarantee you that.
the factory runners are actually way to "slick"..u ever feel how uneven it feels when you rub your finger down one of em?a very smooth runner will cause the fuel to actually stick the runners.just cause a head flows well doesnt mean its gona produce hp either.Ryan Kallina just finished a head for my 10....it was also a epoxy port, and when i got it runnin.....my god the engine felt so much smoother and reved soo much quicker.i think you should do more homework on port jobs....this guy looks to have done an amazing jobI'm not disagreeing with what you are saying about lumps and tooling marks etc. I'm talking about the actual finish of the metal, its like a bore having a 45 degree crosshatch pattern, in theory it increases friction in the bore but it also allows the oil to lubricate the rings properly therefore decreasing friction.
Some people think if you polish an intake runner babies bum smooth you will increase power but you might not. Air flow and heads are complicated when you get into the science of it, like I said before you seem to know what you are doing.
I have a spare head for my 10 and its fair to say that the factory finished intake runners are extremely well done, much better than most performance shops could do, you must have got a real dud one for there to be the imperfections you speak of....